89 heritage softail burning out after market ignition module and headlight

Discussion in 'Electrical' started by Daver1340, Jul 23, 2016.

  1. Daver1340

    Daver1340 Member

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    Hi looking for some advice 89 heritage keeps burning out ignition module and headlight with new ignition module i ride about 4 miles and dies headlight burns out also... will not crank. unless i disconnect ignition module from positive post on ignition coil i have no idea where to start checking for cause
     
  2. Jack Klarich

    Jack Klarich Expert Member

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  3. Daver1340

    Daver1340 Member

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    thanks Jack will try these tests
     
  4. kdaddy

    kdaddy Active Member

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    Same thing happened to my 96 fatboy yrars ago. Bad regulator was allowing overcharge as Jack stated. My battery was also overheating.
     
    Daver1340 likes this.
  5. Daver1340

    Daver1340 Member

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    Thanks kdaddy
     
  6. Jack Klarich

    Jack Klarich Expert Member

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    Older model Softails were notorious for vibration and breaking voltage regulator circuits, scrape the paint where the regulator mounts and use star washers to insure a good ground this will help some, remember the regulator has to regulate the voltage and shunt excess to the air